How can I let a user download multiple files when a button is clicked?

Question

So I have a httpd server running which has links to a bunch of files. Lets say the user selects three files from a file list to download and they\'re located at:

Answer 1

You can either:

1. Zip the selected files and return the one zipped file.
2. Open multiple pop-ups each prompting for a download.

Note - option one is objectively better.

Edit Found an option three: https://stackoverflow.com/a/9425731/1803682